CFD Simulation to Study Effect of Bubble Size in Dissolved Oxygen Increase During Aeration Process

DOI

10.2991/978-94-6463-134-0_22How to use a DOI?

Keywords

Computational Fluid Dynamics; bubble; dissolved oxygen; micro bubble; multiphase; species mass transfer

Abstract

Aeration is a common process in increasing Dissolved Oxygen content in water. A common method for aeration is using large size bubbles which are commonly in the size of 4–10 mm. The simulation is intended to investigate the effect of bubble size (diameter) in oxygen transfer rate, gas hold up and increase of dissolved oxygen. Simulation was performed and validated with experimental works that were performed by Burris and Little [1]. Simulation uses mixture multiphase model for bubble-water interaction and uses multi-species model for counting oxygen transfer between bubbles and water. Simulations with bubble size of 2 and 4 mm reach saturated dissolved oxygen at 7.2 ppm and 20 s of aeration process, while the experiment obtains saturation time at 30 s and dissolved oxygen at 7.0 ppm. Bubble diameter of 1.5 and 0.9 mm have saturation time 30 s and dissolved oxygen at 5.9 ppm. Micro bubbles, ranging from 20 µm until 200 µm, have much longer saturation time and have smaller dissolved oxygen. Micro bubbles have a longer saturation time since their Buoyancy force is much smaller compared to large bubbles. Micro bubbles have saturation time ranging from 70 to 200 s. Longer saturation time indicates longer bubble’s residence time and longer oxygen transfer during aeration process. It is an advantage of micro bubbles in an aeration process that usually has the depth of 10 m. The aeration process can be performed on shallow water if it uses micro bubbles.

Copyright

© 2023 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Nur Ikhwan
PY  - 2023
DA  - 2023/04/19
TI  - CFD Simulation to Study Effect of Bubble Size in Dissolved Oxygen Increase During Aeration Process
BT  - Proceedings of the 6th Mechanical Engineering, Science and Technology International conference (MEST 2022)
PB  - Atlantis Press
SP  - 241
EP  - 249
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-134-0_22
DO  - 10.2991/978-94-6463-134-0_22
ID  - Ikhwan2023
ER  -